The
island of Hoy is said to be have once been the site of a magical
battle. This bloody conflict was between the armies of two men and each night, after the bloodshed, the dead
were reborn.

The battle was between the kings Högni, and
Hedinn Hjarrandason.

Hedinn Hjarrandason had abducted King Högni's
daughter, Hild, while the king was absent from his kingdom.

Upon
his return Högni was enraged and, gathering his forces, set
out in pursuit of Hedinn. Arriving in Norway Högni learned
that Hedinn had sailed west over the sea towards Orkney.

Högni set of in pursuit and found Hedinn,
and Hild, in Hoy.

Hild, who had since married Hedinn, tried to make
peace between her father, offering him a necklace on behalf of her
new husband.

She begged him to avoid conflict, saying that Hedinn
was ready to fight, and if it came to battle, the old king could
expect no mercy at her husband's hand.

But the old king had been insulted and sought
battle. So he ignored his daughter's pleas.

Saddened, Hild returned
to Hedinn and told him there would be no reconciliation. The warriors prepared to fight.

When the two armies deployed for battle, Hedinn
once again tried to make peace, offering the king a fortune in gold
in order to prevent war. But it was not enough.

Högni, who had unsheathed his sword, Dáinsleif,
said the peace offering was too late.

"Your offer of peace comes too late, "
said Högni. "My blade has been drawn. Forged by the dwarves
it cannot be sheathed until it has drawn blood or taken life."

Hedinn glared at the old man.

"You can boast about your sword, but victory
will not be yours. I call any sword good which is faithful to its
master."

So the bloodshed began.

The two armies fought fiercely until nightfall,
when the survivors from both sides retired to their camps, leaving
a battlefield strewn with the dead of both sides.

As the moon crept above the horizon, Hild walked
among the fallen, and with her magic, brought the slain back
to life, ready to fight the same battle the next morning.

By the time the sun arose, those who had fallen
the day before had joined their comrades, ready to resume battle.

Once again, the two sides met fiercely and the
field was reddened with blood.

The arrival of night once again ended the conflict
and, once again, Hild used her magic to revive the fallen so that
they might rise again to fight the same battle.

Thus the cycle continued.

The two armies fought during the day, and at night
the dead were resurrected. They rose again in the morning and gathered
their weapons and shields, which had turned to stone overnight,
to fight another day.

Tradition has it that the two armies were cursed
to fight one another until the day of Ragnarok.

The story of the Eternal Battle appears in the Snorri Sturluson’s Prose Edda. Written around 1220AD, it is an Icelandic manual of poetics, which also contains a number of mythological stories. In its pages, Orkney's Eternal Battle is known as The Strife of the Hjadnings.

A variant of the story can be found in Saxo Grammaticus' The History of the Danes. Written around 1200AD, Saxo's Gesta Danorum recounts the rise and fall of the great rulers of Denmark.

In his account, Saxo strips away all magical elements, explaining how Hogni's daughter, Hildr, was betrothed to Hedin, but following a quarrel, hostilities flared up between the two men. But although King Hogni overpowers Hedin, the king is merciful and allows defeated warrior's men to carry their grieviously-wounded chieftain back to his vessel.

Although Saxo does not state the battle occurs in Orkney, he does add a footnote explaining that the two men met in combat again seven years later.

"In the seventh year after, these same men began to fight on Hedin's Isle, and wounded each other so that they died. Hogni would have been lucky if he had shown severity rather than compassion to Hedin when he once conquered him.

They say that Hildr longed so ardently for her husband, that she is believed to have conjured up the spirits of the combatants by her spells in the night in order to renew the war."
Although the story was well-known in my childhood, it is debatable as to whether it was a legend that had survived orally or was simply a story that was known in Orkney because of Sturlusson’s Prose Edda

It is not recorded in any books on surviving folklore, although Orcadian scholar Ernest Marwick, does refer to it in a paper on Scapa Flow that appears within An Orkney Anthology.